<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    @media print {
  /* 隐藏不需要打印的元素 */
  header, footer, .print-hide, button {
    display: none;
  }
}
  </style>
</head>
<body>
  <div>
    <button onclick="window.print()">打印</button>
    <p>需要打印的内容</p>
  </div>

</body>
</html>